January 21, 2021

LeetCode 679. 24 Game Explanation and Solution



Chinese Version:

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#LeetCode #Algorithms #Backtracking

Nguồn: https://pcr-proven-hiv-cure.com/

Xem thêm bài viết khác: https://pcr-proven-hiv-cure.com/game/

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Comments
  • Hi – this is getting complicated when () are also allowed. for example (1,1,13,1) – usually this is not possible but (1+1)*(13-1) is possible if () are allowed. can you help on this.

  • So I followed your video and the test case it failed at was [1,5,9,1]. I was wondering why? Thank you

  • Very good and clear explanation. Also, it would be helpful if you analyze time and space complexity in all of your solutions. Thanks!!

  • I have a question about term backtracking. In typical backtracking questions we usually have some ways to abandon the solution tree branches early. But that in this problem, we have no way to know right or wrong until the computation reaches the last number. So we are trying out all the combination until we find the solution. Isn't it just brute forcing?

  • Nice! You do explain the overall logic before writing the code, but for some hard problems, we would highly appreciate if you can summarize the logic once again, this time going over the code. Thanks!

  • 厉害。原来核心是要抓一对,我之前一直在纠结只抓一个的话有括号怎么办。谢谢。

  • 最近做这道Shortest Way to Form String 发现也挺有意思的,题目本身用贪心不算难,但是最优解二分有难度,并且一般google会有4个 follow up

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